Re: [PATCH] Yama: handle 32-bit userspace prctl

[James Morris]

On Mon, 27 Aug 2012, Kees Cook wrote:

> When running a 64-bit kernel and receiving prctls from a 32-bit
> userspace, the "-1" used as an unsigned long will end up being
> misdetected. The kernel is looking for 0xffffffffffffffff instead of
> 0xffffffff. Since prctl lacks a distinct compat interface, Yama needs
> to handle this translation itself. As such, support either value as
> meaning PR_SET_PTRACER_ANY, to avoid breaking the ABI for 64-bit.
> 
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next

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